—_______ is the station from your school?
—About 15 minutes by bike.
A:How long
B:How often
C:How far
D:How soon
族
周期
I A
ⅡA
ⅢA
ⅣA
ⅤA
ⅥA
ⅦA
O
1
A
2
D
E
G
I
3
B
C
F
H
点G是△ABC的重心,AG→=λAB→+μAC→,(λ,μ∈R),若∠A=120°,AB→·AC→=-2则|AG→|最小值为____
56÷14=____
640÷40=____
2700÷3=____
620÷31=____
与2是同类二次根式的是( )